<template>
  <!-- 面包屑导航栏 -->
  <el-breadcrumb separator-class="el-icon-arrow-right">
    <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
    <el-breadcrumb-item>商品管理</el-breadcrumb-item>
    <el-breadcrumb-item>分类参数</el-breadcrumb-item>
  </el-breadcrumb>

  <!-- 卡片视图区域 -->
  <el-card>
    <!-- 警告区域 -->
    <el-alert
      show-icon
      title="注意：只允许为第三级分类设置相关参数！"
      type="warning"
      :closable="false"
    ></el-alert>

    <!-- 选择商品分类区域 -->
    <el-row class="cat_opt">
      <el-col>
        <span>选择商品分类：</span>
        <!-- 选择商品分类的级联选择框 -->
        <el-cascader
          v-model="catelist.selectedCateKeys"
          :options="catelist.data"
          :props="catelist.cateProps"
          @change="handleChange"
        ></el-cascader>
      </el-col>
    </el-row>

    <!-- tab 页签区域 -->
    <el-tabs v-model="activeName" @tab-click="handleTabClick">
      <!-- 添加动态参数的面板 -->
      <el-tab-pane label="动态参数" name="many">
        <!-- 动态参数表格 -->
        <el-button
          type="primary"
          size="mini"
          :disabled="isBtnDisabled"
          @click="addDialogVisible = true"
          >添加参数</el-button
        >
        <!-- 静态属性表格 -->
        <el-table :data="manyTableData" border stripe>
          <!-- 展开行 -->
          <el-table-column type="expand">
            <template v-slot="scope">
              <!-- 循环渲染Tag标签 -->
              <el-tag
                v-for="(item, i) in scope.row.attr_vals"
                :key="i"
                closable
                @close="handleClose(i, scope.row)"
                >{{ item }}</el-tag
              >
              <!-- 输入的文本框 -->
              <el-input
                class="input-new-tag"
                v-if="scope.row.inputVisible"
                v-model="scope.row.inputValue"
                ref="saveTagInput"
                size="small"
                @keyup.enter="handleInputConfirm(scope.row)"
                @blur="handleInputConfirm(scope.row)"
              >
              </el-input>
              <!-- 添加按钮 -->
              <el-button
                v-else
                class="button-new-tag"
                size="small"
                @click="showInput(scope.row)"
              >
                + New Tag
              </el-button>
            </template>
          </el-table-column>
          <!-- 索引列 -->
          <el-table-column type="index"></el-table-column>
          <el-table-column label="属性名称" prop="attr_name"></el-table-column>
          <el-table-column label="操作">
            <template v-slot="scope">
              <el-button
                size="mini"
                type="primary"
                icon="el-icon-edit"
                @click="showEditDialog(scope.row.attr_id)"
                >编辑</el-button
              >
              <el-button
                size="mini"
                type="danger"
                icon="el-icon-delete"
                @click="removeParams(scope.row.attr_id)"
                >删除</el-button
              >
            </template>
          </el-table-column>
        </el-table>
      </el-tab-pane>
      <!-- 添加静态属性的面板 -->
      <el-tab-pane label="静态参数" name="only">
        <!-- 添加参数的按钮 -->
        <el-button
          type="primary"
          size="mini"
          :disabled="isBtnDisabled"
          @click="addDialogVisible = true"
          >添加属性</el-button
        >
        <!-- 静态属性表格 -->
        <el-table :data="onlyTableData" border stripe>
          <!-- 展开行 -->
          <el-table-column type="expand">
            <template v-slot="scope">
              <!-- 循环渲染Tag标签 -->
              <el-tag
                v-for="(item, i) in scope.row.attr_vals"
                :key="i"
                closable
                @close="handleClose(i, scope.row)"
                >{{ item }}</el-tag
              >
              <!-- 输入的文本框 -->
              <el-input
                class="input-new-tag"
                v-if="scope.row.inputVisible"
                v-model="scope.row.inputValue"
                ref="saveTagInput"
                size="small"
                @keyup.enter="handleInputConfirm(scope.row)"
                @blur="handleInputConfirm(scope.row)"
              >
              </el-input>
              <!-- 添加按钮 -->
              <el-button
                v-else
                class="button-new-tag"
                size="small"
                @click="showInput(scope.row)"
              >
                + New Tag
              </el-button>
            </template>
          </el-table-column>
          <!-- 索引列 -->
          <el-table-column type="index"></el-table-column>
          <el-table-column label="属性名称" prop="attr_name"></el-table-column>
          <el-table-column label="操作">
            <template v-slot="scope">
              <el-button
                size="mini"
                type="primary"
                icon="el-icon-edit"
                @click="showEditDialog(scope.row.attr_id)"
                >编辑</el-button
              >
              <el-button
                size="mini"
                type="danger"
                icon="el-icon-delete"
                @click="removeParams(scope.row.attr_id)"
                >删除</el-button
              >
            </template>
          </el-table-column>
        </el-table>
      </el-tab-pane>
    </el-tabs>
  </el-card>

  <!-- 添加参数的对话框 -->
  <el-dialog
    :title="'添加' + titleText"
    v-model="addDialogVisible"
    width="50%"
    @close="addDialogClosed"
  >
    <!-- 添加参数的对话框 -->
    <el-form
      :model="addForm"
      :rules="addFormRules"
      ref="addFormRef"
      label-width="100px"
    >
      <el-form-item :label="titleText" prop="attr_name">
        <el-input v-model="addForm.attr_name"></el-input>
      </el-form-item>
    </el-form>
    <template #footer>
      <span class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </template>
  </el-dialog>

  <!-- 修改参数的对话框 -->
  <el-dialog
    :title="'修改' + titleText"
    v-model="editDialogVisible"
    width="50%"
    @close="editDialogClosed"
  >
    <!-- 添加参数的对话框 -->
    <el-form
      :model="editForm"
      :rules="editFormRules"
      ref="editFormRef"
      label-width="100px"
    >
      <el-form-item :label="titleText" prop="attr_name">
        <el-input v-model="editForm.attr_name"></el-input>
      </el-form-item>
    </el-form>
    <template #footer>
      <span class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </template>
  </el-dialog>
</template>

<script>
import {
  getCurrentInstance,
  onMounted,
  reactive,
  ref,
  computed,
  toRefs,
  inject,
} from "vue";
export default {
  setup() {
    // 获取vue实例
    const { proxy } = getCurrentInstance();
    // 注入一个axios
    const axios = inject("axios");

    const catelist = reactive({
      data: [], // 商品分类列表
      cateProps: {
        // 级联选择框的配置对象
        value: "cat_id",
        label: "cat_name",
        children: "children",
        expandTrigger: "hover",
      },
      selectedCateKeys: [], // 级联选择框双向绑定到的数组
    });
    // 被激活的页签的名称
    let activeName = ref("many");
    const activeData = reactive({
      // 动态参数的数据
      manyTableData: [],
      // 静态属性的数据
      onlyTableData: [],
    });

    // 控制添加对话框的显示与隐藏
    let addDialogVisible = ref(false);
    // 添加参数的表单数据对象
    const addForm = reactive({
      attr_name: "",
    });
    // 添加表单的验证规则对象
    const addFormRules = {
      attr_name: [
        { required: true, message: "请输入参数名称", trigger: "blur" },
      ],
    };
    // 获取dom
    let addFormRef = ref(null);

    // 控制修改对话框的显示与隐藏
    let editDialogVisible = ref(false);
    // 修改参数的表单数据对象
    let edit = reactive({
      editForm: {},
    });
    // 修改表单的验证规则对象
    const editFormRules = {
      attr_name: [
        { required: true, message: "请输入参数名称", trigger: "blur" },
      ],
    };
    // 获取修改dom
    let editFormRef = ref(null);

    // 页面初始化请求数据
    const getCateList = async () => {
      catelist.data = [];
      const { data: res } = await axios.get("categories");
      if (res.meta.status !== 200)
        return proxy.$message.error("获取商品分类失败!");
      catelist.data = res.data;
    };
    onMounted(function () {
      getCateList();
    });
    // 级联选择框选中项变化，会触发这个函数
    const handleChange = () => {
      getParamsData();
    };
    // tab 页签点击事件的处理函数
    const handleTabClick = () => {
      getParamsData();
    };

    // 获取参数的列表数据
    const getParamsData = async () => {
      // 证明选中的不是三级分类
      if (catelist.selectedCateKeys.length !== 3) {
        catelist.selectedCateKeys = [];
        activeData.manyTableData = [];
        activeData.onlyTableData = [];
        return;
      }

      // 根据所选分类的Id，和当前所处的面板，获取对应的参数
      const { data: res } = await axios.get(
        `categories/${proxy.cateId}/attributes`,
        {
          params: { sel: activeName.value },
        }
      );

      if (res.meta.status !== 200)
        return proxy.$message.error("获取参数列表失败！");

      res.data.forEach((item) => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(" ") : [];
        // 控制文本框的显示与隐藏
        item.inputVisible = false;
        // 文本框中输入的值
        item.inputValue = "";
      });

      if (activeName.value === "many") {
        activeData.manyTableData = res.data;
      } else {
        activeData.onlyTableData = res.data;
      }
    };

    // 监听添加对话框的关闭事件
    const addDialogClosed = () => {
      addFormRef.value.resetFields();
    };

    // 点击按钮，添加参数
    const addParams = () => {
      addFormRef.value.validate(async (valid) => {
        if (!valid) return;
        const { data: res } = await axios.post(
          `categories/${proxy.cateId}/attributes`,
          {
            attr_name: addForm.attr_name,
            attr_sel: activeName.value,
          }
        );

        if (res.meta.status !== 201) {
          return proxy.$message.error("添加参数失败！");
        }

        proxy.$message.success("添加参数成功！");
        addDialogVisible.value = false;
        getParamsData();
      });
    };

    // 点击按钮，展示修改的对话框
    const showEditDialog = async (attr_id) => {
      // 查询当前参数的信息
      const { data: res } = await axios.get(
        `categories/${proxy.cateId}/attributes/${attr_id}`,
        {
          params: { attr_sel: activeName.value },
        }
      );

      if (res.meta.status !== 200) {
        return proxy.$message.error("获取参数信息失败！");
      }

      edit.editForm = res.data;
      editDialogVisible.value = true;
    };

    // 重置修改的表单
    const editDialogClosed = () => {
      editFormRef.value.resetFields();
    };

    // 点击按钮，修改参数信息
    const editParams = () => {
      editFormRef.value.validate(async (valid) => {
        if (!valid) return;
        const { data: res } = await axios.put(
          `categories/${proxy.cateId}/attributes/${edit.editForm.attr_id}`,
          { attr_name: edit.editForm.attr_name, attr_sel: activeName.value }
        );

        if (res.meta.status !== 200) {
          return proxy.$message.error("修改参数失败!");
        }

        proxy.$message.success("修改参数成功!");
        getParamsData();
        editDialogVisible.value = false;
      });
    };

    // 根据Id删除对应的参数项
    const removeParams = async (attr_id) => {
      const confirmResult = await proxy
        .$confirm("此操作将永久删除该参数, 是否继续?", "提示", {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning",
        })
        .catch((err) => err);

      // 用户取消了删除的操作
      if (confirmResult !== "confirm") {
        return proxy.$message.info("已取消删除！");
      }

      // 删除的业务逻辑
      const { data: res } = await axios.delete(
        `categories/${proxy.cateId}/attributes/${attr_id}`
      );

      if (res.meta.status !== 200) {
        return proxy.$message.error("删除参数失败！");
      }

      proxy.$message.success("删除参数成功！");
      getParamsData();
    };

    // 文本框失去焦点，或摁下了 Enter 都会触发
    const handleInputConfirm = async (row) => {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = "";
        row.inputVisible = false;
        return;
      }
      // 如果没有return，则证明输入的内容，需要做后续处理
      row.attr_vals.push(row.inputValue.trim());
      row.inputValue = "";
      row.inputVisible = false;
      // 需要发起请求，保存这次操作
      saveAttrVals(row);
    };
    // 将对 attr_vals 的操作，保存到数据库
    const saveAttrVals = async (row) => {
      // 需要发起请求，保存这次操作
      const { data: res } = await axios.put(
        `categories/${proxy.cateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(" "),
        }
      );

      if (res.meta.status !== 200) {
        return proxy.$message.error("修改参数项失败！");
      }

      proxy.$message.success("修改参数项成功！");
    };

    // 点击按钮，展示文本输入框
    const showInput = (row) => {
      row.inputVisible = true;
      // 让文本框自动获得焦点
      // $nextTick 方法的作用，就是当页面上元素被重新渲染之后，才会指定回调函数中的代码
      // proxy.$nextTick(() => {
      //   proxy.$refs.saveTagInput.$refs.input.focus()
      // })
    };

    // 删除对应的参数可选项
    const handleClose = (i, row) => {
      row.attr_vals.splice(i, 1);
      saveAttrVals(row);
    };

    // 如果按钮需要被禁用，则返回true，否则返回false
    const isBtnDisabled = computed(() => {
      if (catelist.selectedCateKeys.length !== 3) return true;
      return false;
    });

    // 当前选中的三级分类的Id
    const cateId = computed(() => {
      if (catelist.selectedCateKeys.length === 3)
        return catelist.selectedCateKeys[2];
      return null;
    });

    // 动态计算标题的文本
    const titleText = computed(() => {
      if (activeName.value === "many") return "动态参数";
      return "静态属性";
    });

    return {
      catelist,
      activeName,
      ...toRefs(activeData),
      addDialogVisible,
      addForm,
      addFormRules,
      addFormRef,
      editDialogVisible,
      ...toRefs(edit),
      editFormRules,
      editFormRef,
      handleChange,
      handleTabClick,
      addDialogClosed,
      addParams,
      showEditDialog,
      editDialogClosed,
      editParams,
      removeParams,
      handleInputConfirm,
      showInput,
      handleClose,
      isBtnDisabled,
      cateId,
      titleText,
    };
  },
};
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}

.el-tag {
  margin: 10px;
}

.input-new-tag {
  width: 120px;
}
</style>